How to Install Fiberglass Rebar

A Guide to Fiberglass Rebar in Concrete

Fiberglass rebar is a structural reinforcing material made from fiberglass roving and resin, and it offers several advantages over steel rebar:

Greater tensile strength and a higher modulus of elasticity
Lower weight, making it easier to handle
Resistance to corrosion and long-term durability
Electrical non-conductivity and electromagnetic neutrality
The ability to be cut by standard earth removal equipment and tunnel boring machines

Typical concrete applications for fiberglass rebar include:

Concrete in corrosive environments, including marine, chemical, and electrical facility settings

Building construction and restoration work, such as foundations, slabs, walls, columns, and beams

Masonry reinforcement, for example seismic, wind, and blast strengthening of unreinforced masonry

Agricultural and dairy applications, such as flooring in barns, hog houses, and poultry farms

Concrete pavement work, such as dowel bars that transfer load between slabs

Guidelines for Installation

Follow these guidelines to get proper performance from fiberglass rebar in concrete:

Cut, bend, tie, and place fiberglass rebar with appropriate tools and equipment, avoiding anything that could damage the rebar’s surface or structural integrity.

Match the size, spacing, length, shape, and placement of the rebar to the design specifications and drawings, and obtain engineer or architect approval before deviating from the design.

Give the rebar adequate concrete cover and clearance based on code requirements and environmental conditions; most applications call for a minimum cover of 1 inch (25 mm).

Pair the rebar with compatible accessories, such as chairs, spacers, ties, and clips, and avoid metal or corrosive materials that could trigger galvanic reactions or degrade the rebar.

Place and consolidate the concrete around the rebar carefully to prevent voids, honeycombing, cracking, or segregation, using suitable vibration methods to achieve good bond and compaction.

Engineering Standards & Project ROI Insights

Solution Executive Summary: Fiberglass rebar goes into a concrete pour the same way steel rebar does, but its non-conductivity and cut-ability by standard earth-moving and tunnel-boring equipment make it the practical choice on sites where those two properties specifically matter.

Project Factor	Fiberglass Rebar	Steel Rebar	Timber Reinforcement
Tensile Strength/Modulus of Elasticity	Higher than steel	Good baseline	Low
Weight/Handling	Lighter, easier handling	Heavier	Light but weak
Corrosion Resistance	Full resistance and durability	Corrodes	Rots
Cut-ability by Earth-Moving/Tunnel-Boring Equipment	Cuttable by standard equipment	Damages/dulls cutting equipment	Not applicable/not used this way

Project Implementation FAQ

Q1: What construction applications use fiberglass rebar?

Answer: Concrete exposed to corrosive environments (marine, chemical, or electrical facilities), building construction and preservation (foundations, slabs, walls, columns, beams), and masonry reinforcement.

Q2: Why is fiberglass rebar’s non-conductivity useful on a construction site?

Answer: Non-conductivity and electromagnetic neutrality make it suitable for applications where steel’s conductive properties would be a liability, such as near sensitive electrical equipment.

Q3: What does “cut-ability by tunnel boring machines” mean for fiberglass rebar?

Answer: Unlike steel, fiberglass rebar can be cut through by standard earth removal equipment and tunnel boring machines, which is a specific advantage in tunneling and earthworks projects where reinforcement may need to be bored through.

Q4: Is fiberglass rebar installed the same way as steel rebar?

Answer: Yes, it’s placed and tied into concrete formwork using the same general reinforcement principles as steel rebar, sized and spaced according to the structural design.